Principle of marketing

First time I put much effort on one subject~

This subject make me much crazy

Need memorize a lot of theories and definitions

This subject really harder than I thought

Already three days burn midnight oil because of this subject

Want to do almost 4 set of pass year question

To ensure I still remember the principle of it

Is the first time I write much notes because of it

and search internet for the examples of the theories

~Add oil on it,Freddie,Just do it(Nike company motto)~